Author: theraven
Date: Mon Jan 16 18:19:53 2012
New Revision: 230225
URL: http://svn.freebsd.org/changeset/base/230225
Log:
Use the signal fence builtin in stdatomic.h when using the clang atomic
builtins, rather than the __asm hack. Somehow I missed the existence of this
builtin originally and only noticed that it was there when I went to implement
it...
Note: Trunk clang now has support for (most of) the C[++]11 atomics stuff.
Please test!
Approved by: brooks (mentor)
Modified:
head/include/stdatomic.h
Modified: head/include/stdatomic.h
==============================================================================
--- head/include/stdatomic.h Mon Jan 16 17:31:26 2012 (r230224)
+++ head/include/stdatomic.h Mon Jan 16 18:19:53 2012 (r230225)
@@ -104,10 +104,7 @@ enum memory_order {
* 7.17.4 Fences.
*/
-#if defined(__CLANG_ATOMICS)
-#define atomic_thread_fence(order) __atomic_thread_fence(order)
-#define atomic_signal_fence(order) __asm volatile ("" : : :
"memory")
-#elif defined(__GNUC_ATOMICS)
+#if defined(__CLANG_ATOMICS) || defined(__GNUC_ATOMICS)
#define atomic_thread_fence(order) __atomic_thread_fence(order)
#define atomic_signal_fence(order) __atomic_signal_fence(order)
#else
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